84 lines
2.5 KiB
JavaScript
84 lines
2.5 KiB
JavaScript
/**
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* iwlist - a powerful tool with a horrible output
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* Created by kc on 04.04.16.
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*/
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const _ = require('lodash');
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const tool = '/usr/bin/iwlist';
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const cmdLine = tool + ' scan';
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const macRegex = /([0-9a-zA-Z]{1}[0-9a-zA-Z]{1}[:]{1}){5}[0-9a-zA-Z]{1}[0-9a-zA-Z]{1}/;
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const cellRegex = /Cell [0-9]{2,} - Address:/;
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/**
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* Parsing the output of iwlist, tool having a lot of different faces :-(
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* @param str output of the tool
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* @param callback
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*/
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function parseOutput(str, callback) {
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var err = null;
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var wifis = [];
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try {
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var blocks = str.split(cellRegex);
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blocks.forEach(block => {
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var network = {};
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var lines = block.split('\n');
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if (macRegex.exec(lines[0])) {
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// First line is the mac address (always! (?))
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network.mac = lines[0].trim();
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lines.forEach(line => {
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// SSID
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if (line.indexOf('ESSID:') > 0) {
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network.ssid = _.trim(line.split(':')[1], '"');
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if (_.startsWith(network.ssid, '\\x00')) {
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// The raspi 3 interprets a string terminator as character, it's an empty SSID
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network.ssid = '';
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}
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}
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// Channel, an ugly thing to get it
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else if (_.startsWith(line.trim(), 'Frequency:')) {
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network.channel = parseInt(_.trim(line, ' )').split(/Channel/)[1], 10);
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}
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// Another ugly thing, the signal which can have different formats, even worse als
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// having different identifiers
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else if (line.indexOf('Signal level') > -1) {
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if (line.indexOf('Quality') > -1) {
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// This is a "Quality=40/70 Signal level=-70 dBm" line
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network.rssi = parseInt(line.substr(line.indexOf('Signal level') + 13), 10);
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}
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else {
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// This is a "Signal level=60/100" line
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var elements = line.split('=');
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elements.forEach(e => {
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if (e.indexOf('/') > 0) {
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// that's our part
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var parts = e.split('/');
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var level = Math.floor(100 * parseInt(parts[0], 10) / parseInt(parts[1], 10));
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network.rssi = level / 2 - 100;
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}
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})
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}
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}
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});
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wifis.push(network);
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}
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});
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}
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catch (ex) {
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err = ex;
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}
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callback(err, wifis);
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}
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module.exports = {
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parseOutput: parseOutput,
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cmdLine : cmdLine,
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tool : tool
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};
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